/// <summary> Constructs a Grib1BinaryDataSection object from a raf.
/// A bit map is defined.
///
/// </summary>
/// <param name="raf">raf with BDS content
/// </param>
/// <param name="decimalscale">the exponent of the decimal scale
/// </param>
/// <param name="bms">bit map section of GRIB record
///
/// </param>
/// <throws> NotSupportedException if stream contains no valid GRIB file </throws>
//UPGRADE_TODO: Class 'java.io.RandomAccessFile' was converted to 'System.IO.FileStream' which has a different behavior. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1073_javaioRandomAccessFile'"
public Grib1BinaryDataSection(System.IO.FileStream raf, int decimalscale, Grib1BitMapSection bms)
{
// octets 1-3 (section length)
length = (int)GribNumbers.uint3(raf);
//System.out.println( "BDS length = " + length );
// octet 4, 1st half (packing flag)
int unusedbits = raf.ReadByte();
// TODO Check this!!!
if ((unusedbits & 192) != 0)
{
throw new NotSupportedException("BDS: (octet 4, 1st half) not grid point data and simple packing ");
}
// octet 4, 2nd half (number of unused bits at end of this section)
unusedbits = unusedbits & 15;
//System.out.println( "BDS unusedbits = " + unusedbits );
// octets 5-6 (binary scale factor)
int binscale = GribNumbers.int2(raf);
// octets 7-10 (reference point = minimum value)
float refvalue = GribNumbers.float4(raf);
// octet 11 (number of bits per value)
int numbits = raf.ReadByte();
//System.out.println( "BDS numbits = " + numbits );
if (numbits == 0)
{
isConstant = true;
}
//System.out.println( "BDS isConstant = " + isConstant );
// *** read values *******************************************************
//UPGRADE_WARNING: Data types in Visual C# might be different. Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
float ref_Renamed = (float)(System.Math.Pow(10.0, -decimalscale) * refvalue);
//UPGRADE_WARNING: Data types in Visual C# might be different. Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
float scale = (float)(System.Math.Pow(10.0, -decimalscale) * System.Math.Pow(2.0, binscale));
if (bms != null)
{
bool[] bitmap = bms.Bitmap;
values = new float[bitmap.Length];
for (int i = 0; i < bitmap.Length; i++)
{
if (bitmap[i])
{
if (!isConstant)
{
values[i] = ref_Renamed + scale * bits2UInt(numbits, raf);
}
else
{
// rdg - added this to handle a constant valued parameter
values[i] = ref_Renamed;
}
}
else
{
values[i] = Grib1BinaryDataSection.UNDEFINED;
}
}
}
else
{
// bms is null
if (!isConstant)
{
//System.out.println( "BDS values.size = " +
//(((length - 11) * 8 - unusedbits) / numbits));
values = new float[((length - 11) * 8 - unusedbits) / numbits];
for (int i = 0; i < values.Length; i++)
{
values[i] = ref_Renamed + scale * bits2UInt(numbits, raf);
}
}
else
{
// constant valued - same min and max
int x = 0, y = 0;
raf.Seek(raf.Position - 53, System.IO.SeekOrigin.Begin); // return to start of GDS
length = (int)GribNumbers.uint3(raf);
if (length == 42)
{
// Lambert/Mercator offset
SupportClass.Skip(raf, 3);
x = GribNumbers.int2(raf);
y = GribNumbers.int2(raf);
}
else
{
SupportClass.Skip(raf, 7);
length = (int)GribNumbers.uint3(raf);
if (length == 32)
{
// Polar sterographic
SupportClass.Skip(raf, 3);
x = GribNumbers.int2(raf);
y = GribNumbers.int2(raf);
}
else
{
x = y = 1;
System.Console.Out.WriteLine("BDS constant value, can't determine array size");
}
}
values = new float[x * y];
for (int i = 0; i < values.Length; i++)
{
values[i] = ref_Renamed;
}
}
}
} // end Grib1BinaryDataSection
/// <summary> Constructs a <tt>Grib1GridDefinitionSection</tt> object from a raf.
///
/// </summary>
/// <param name="raf">RandomAccessFile with GDS content
///
/// </param>
/// <throws> NoValidGribException if raf contains no valid GRIB info </throws>
//UPGRADE_TODO: Class 'java.io.RandomAccessFile' was converted to 'System.IO.FileStream' which has a different behavior. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1073_javaioRandomAccessFile'"
public Grib1GridDefinitionSection(System.IO.FileStream raf)
{
int reserved; // used to read empty space
// octets 1-3 (Length of GDS)
length = (int)GribNumbers.uint3(raf);
if (length == 0)
{
// there's a extra byte between PDS and GDS
SupportClass.Skip(raf, -2);
length = (int)GribNumbers.uint3(raf);
}
//System.out.println( "GDS length = " + length );
// TODO Fix Checksum stuff
// get byte array for this gds, then reset raf to same position
// calculate checksum for this gds via the byte array
/*
* long mark = raf.Position;
* sbyte[] dst = new sbyte[length - 3];
* SupportClass.ReadInput(raf, dst, 0, dst.Length);
* raf.Seek(mark, System.IO.SeekOrigin.Begin);
* //UPGRADE_ISSUE: Class 'java.util.zip.CRC32' was not converted. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1000_javautilzipCRC32'"
* //UPGRADE_ISSUE: Constructor 'java.util.zip.CRC32.CRC32' was not converted. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1000_javautilzipCRC32'"
* CRC32 cs = new CRC32();
* //UPGRADE_ISSUE: Method 'java.util.zip.CRC32.update' was not converted. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1000_javautilzipCRC32'"
* cs.update(dst);
* //UPGRADE_ISSUE: Method 'java.util.zip.CRC32.getValue' was not converted. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1000_javautilzipCRC32'"
* checksum = System.Convert.ToString(cs.getValue());
* //System.out.println( "GDS checksum =" + checksum );
*/
// octets 4 NV
int NV = raf.ReadByte();
//System.out.println( "GDS NV = " + NV );
// octet 5 PL the location (octet number) of the list of numbers of points in each row
P_VorL = raf.ReadByte();
//System.out.println( "GDS PL = " + P_VorL );
// octet 6 (grid type)
type = raf.ReadByte();
//System.out.println( "GDS grid type = " + type );
name = getName(type);
if (type != 50)
{
// values same up to resolution
// octets 7-8 (Nx - number of points along x-axis)
nx = GribNumbers.int2(raf);
nx = (nx == -1)?1:nx;
// octets 9-10 (Ny - number of points along y-axis)
ny = GribNumbers.int2(raf);
ny = (ny == -1)?1:ny;
// octets 11-13 (La1 - latitude of first grid point)
lat1 = GribNumbers.int3(raf) / 1000.0;
// octets 14-16 (Lo1 - longitude of first grid point)
lon1 = GribNumbers.int3(raf) / 1000.0;
// octet 17 (resolution and component flags). See Table 7
resolution = raf.ReadByte();
}
switch (type)
{
// Latitude/Longitude grids , Arakawa semi-staggered e-grid rotated
// Arakawa filled e-grid rotated
case 0:
case 4:
case 40:
case 201:
case 202:
// octets 18-20 (La2 - latitude of last grid point)
lat2 = GribNumbers.int3(raf) / 1000.0;
// octets 21-23 (Lo2 - longitude of last grid point)
lon2 = GribNumbers.int3(raf) / 1000.0;
// octets 24-25 (Dx - Longitudinal Direction Increment )
dx = GribNumbers.int2(raf) / 1000.0;
// octets 26-27 (Dy - Latitudinal Direction Increment )
// Np - parallels between a pole and the equator
if (type == 4)
{
np = GribNumbers.int2(raf);
}
else
{
dy = GribNumbers.int2(raf) / 1000.0;
}
// octet 28 (Scanning mode) See Table 8
scan = raf.ReadByte();
// octet 29-32 reserved
reserved = GribNumbers.int4(raf);
if (length > 32)
{
// getP_VorL(raf);
// Vertical coordinates (NV) and thinned grids (PL) not supported - skip this
SupportClass.Skip(raf, length - 32);
}
break; // end Latitude/Longitude grids
case 1: // Mercator grids
// octets 18-20 (La2 - latitude of last grid point)
lat2 = GribNumbers.int3(raf) / 1000.0;
// octets 21-23 (Lo2 - longitude of last grid point)
lon2 = GribNumbers.int3(raf) / 1000.0;
// octets 24-26 (Latin - latitude where cylinder intersects the earth
latin1 = GribNumbers.int3(raf) / 1000.0;
// octet 27 reserved
reserved = raf.ReadByte();
// octet 28 (Scanning mode) See Table 8
scan = raf.ReadByte();
// octets 29-31 (Dx - Longitudinal Direction Increment )
dx = GribNumbers.int3(raf);
// octets 32-34 (Dx - Longitudinal Direction Increment )
dy = GribNumbers.int3(raf);
// octet 35-42 reserved
reserved = GribNumbers.int4(raf);
reserved = GribNumbers.int4(raf);
if (length > 42)
{
// getP_VorL(raf);
// Vertical coordinates (NV) and thinned grids (PL) not supported - skip this
SupportClass.Skip(raf, length - 42);
}
break; // end Mercator grids
case 3: // Lambert Conformal
// octets 18-20 (Lov - Orientation of the grid - east lon parallel to y axis)
lov = GribNumbers.int3(raf) / 1000.0;
// octets 21-23 (Dx - the X-direction grid length) See Note 2 of Table D
dx = GribNumbers.int3(raf);
// octets 24-26 (Dy - the Y-direction grid length) See Note 2 of Table D
dy = GribNumbers.int3(raf);
// octets 27 (Projection Center flag) See Note 5 of Table D
proj_center = raf.ReadByte();
// octet 28 (Scanning mode) See Table 8
scan = raf.ReadByte();
// octets 29-31 (Latin1 - first lat where secant cone cuts spherical earth
latin1 = GribNumbers.int3(raf) / 1000.0;
// octets 32-34 (Latin2 - second lat where secant cone cuts spherical earth)
latin2 = GribNumbers.int3(raf) / 1000.0;
// octets 35-37 (lat of southern pole)
latsp = GribNumbers.int3(raf) / 1000.0;
// octets 38-40 (lon of southern pole)
lonsp = GribNumbers.int3(raf) / 1000.0;
// octets 41-42
reserved = GribNumbers.int2(raf);
if (length > 42)
{
// getP_VorL(raf);
// Vertical coordinates (NV) and thinned grids (PL) not supported - skip this
SupportClass.Skip(raf, length - 42);
}
break; // end Lambert Conformal
case 5: // Polar Stereographic grids
// octets 18-20 (Lov - Orientation of the grid - east lon parallel to y axis)
lov = GribNumbers.int3(raf) / 1000.0;
// octets 21-23 (Dx - Longitudinal Direction Increment )
dx = GribNumbers.int3(raf);
// octets 24-26(Dy - Latitudinal Direction Increment )
dy = GribNumbers.int3(raf);
// octets 27 (Projection Center flag) See Note 5 of Table D
proj_center = raf.ReadByte();
// octet 28 (Scanning mode) See Table 8
scan = raf.ReadByte();
// octet 29-32 reserved
reserved = GribNumbers.int4(raf);
if (length > 32)
{
// getP_VorL(raf);
// Vertical coordinates (NV) and thinned grids (PL) not supported - skip this
SupportClass.Skip(raf, length - 32);
}
break; // end Polar Stereographic grids
//rotated grid
case 10:
//18-20
this.lat2 = GribNumbers.int3(raf) / 1000.0;
//21-23
this.lon2 = GribNumbers.int3(raf) / 1000.0;
//24-25
var tmpDx = GribNumbers.int2(raf);
this.dx = tmpDx == -1 ? -9999.0 : tmpDx / 1000.0;
//26-27
var tmpDy = GribNumbers.int2(raf);
this.dy = tmpDy == -1 ? -9999.0 : tmpDy / 1000.0;
//28
scan = raf.ReadByte();
//29-32
GribNumbers.int4(raf);
//33-35
this.latsp = GribNumbers.int3(raf) / 1000.0;
//36-38
this.lonsp = GribNumbers.int3(raf) / 1000.0;
//39-42 - angle
GribNumbers.float4(raf);
if (length > 42)
{
SupportClass.Skip(raf, length - 42);
}
break;
default:
System.Console.Out.WriteLine("Unknown Grid Type : " + type);
break;
} // end switch grid_type
//System.out.println( "scan=" + scan );
if ((scan & 63) != 0)
{
throw new NoValidGribException("GDS: This scanning mode (" + scan + ") is not supported.");
}
} // end Grib1GridDefinitionSection( raf )
